Derivative Instruments and Hedging Activities - Schedule of Summary of Derivative Hedges (Detail) $ in Thousands	3 Months Ended
	Aug. 31, 2018 USD ($)
Commodity Contracts | Minimum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Notional Amount	$ 27,961
Maturity Date	2018-09
Commodity Contracts | Maximum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Maturity Date	2020-02
Foreign Currency Contracts | Minimum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Notional Amount	$ 6,647
Maturity Date	2018-09
Foreign Currency Contracts | Maximum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Maturity Date	2019-05
Cash Flow Hedges | Commodity Contracts | Minimum
Derivative [Line Items]
Notional Amount	$ 12,181
Maturity Date	2018-09
Cash Flow Hedges | Commodity Contracts | Maximum
Derivative [Line Items]
Maturity Date	2019-09